Improvement in sewing-machines



3 Sheets-*Sheet l.

C; `0. CROSBY.-

Sewing Machine.

Patented 0ct'.A 12, 1858.

www

Sew-ing Mahne.

No. 21,745.l

Patentned Oct. 1 2, 1858.

Y3 Sheets-Sheet C. 0. CROSBY.

Sewing Machine.

Patented Oct. 12,1858.

UNITED f STATES PATENT OFFICE.

cHAUNcEY o. cn'osnr, on NEW HAVEN, conN-Ecfrrcufr.

y' IMPROVEMENT IN-SEQWI'NG-NMACH'INes..

Specification forming paxt of Letters Patent No. 21,745, dated October lf2, .l

Be .it known that l, CHAUNCEY 0; CROSBY, of the city and county of New Haven, in the State of Connecticut, have invented a new and useful improvement in Sewing-Machines, and l do hereby declare that the following is a'full, clear, and exact description of the construe` tion, character, and'voperation of the same,

.reference being had to the accompanying drawings, which niake a part of this specification, in which- Figure l is a vertical plan of the whole inachine as viewed from the right-hand side. Fi 0. 2 is a vertical plan of the saine viewed from theit'ront end, showing the needle-bar, thimble-ioar, the tape-pulleys with the endless tapes, the-gear-wheels, Sie. Fig.v 3 is a vertical plan oi' the" same viewed from the front end, showing the cams, levers, dro. Fig. 4 is a birds-eye view of a portion. of the' same, showin'g the relative position of the tape-puh le'ys, needlehar with needle, position ofthe cloth, &c., during the backward movement of the needle-bar. Fig. 5 is a birdseye view of a portion. oi' Fig. 4, showing the positions in the forward movement of the needle-bar. Fi fr. 6 a view of the cani-wheel displayed as a horizontal plane, showing the cams on each side. Fig. S is a plan of the bar which passes through the needle-bar to release -the needle, as o, 3. lfigd'l is a planof the hooks 'which carry the loop of the slack thread to the' endless tapes.

)ly improvement consists in. so constructing the machine that by the arrangement and combination of the several devices l am able lo imitate (so i'ar as is beneficial) the manipulations of sewing by hand, so far as the thumb and the iirst two fingers oi' the left hand are used in holding the cloth and those of the right hand in using the needle, (as l' use but one common sewing-needle and but one thread, as in sewing by.hand,) and in the method oi drawing the imain' portion of the thread through the cloth, controlling the slack thread, and drawing up the stitch without Vany strain upon theeyeaofi'V the needle of the thread where it rests in the eye ot' the needle, or ei' ehaiing the thread by drawing it through at an acute angle with the cloth, each of which evils occur `in sewing by hand.

l-inake the i'rainc A, &c., oi' cast-iron, or

au; other suitable material, substantially in the form shown in Fig.

l, or any other convenient form.

I make the cloth-'holder of a pair-of spring l jaws or clamps, c a,'as represente in longitudinal plan in Fig. 1, in cross-section in Fig.

2, and in birdseye View in Fig. 4, (which ,j

represent the thumb and middle linger of the left hand.) The jaws are sustained by a split bar, (which parts .serve as spring,) as indiby a thumb-screw, as atG, Fig. l; but neither'y of these is very material; and I have fa tongue orpiece, as shown at b, Fie. 3, which passes up between the jaws c a, as seen in Fig. 2, to force up the bight 'or bend of the cloth, as signified in Fig. 4; to allow the needle to pass through it. This tongue repre sents the foretinger of the left hand in sewing. yThis tongue is tit-ted' into the upperrend of the frame g, Figs. 1,2, and 3, to render it susceptible of being changed to suitthe thick! ness of the cloth, as thicker cloth will require a thicker tongue to prevent bending it too short; and this frame f/ is elevated by the operation of the cam No. l, Figs. l and 3, through the medium ot the bar l), Figs. and 3, rock-shaft E, Figs l, 2, and 3, and lever'c, Figs. 2 and 3, and it is depressed by thespring f, Fig. 2, acting on the end'of the lever e. 'Across the center ofthese jaws a c and tongue b, I out a V-shaped notch, as indicated inFig. 4, to,y allow the needle to pass through the cloth without touching the jaws or tongue, and prevent injuring the point'of the needle or chai ing the thread. y

l make the needle-bar Il, Figs. l7 2, 3, 4, and 5, of iron or any other suitable material, substantially in the forni indicated in Fig. 3, and'r in the lower end I cut a notch or slot of suitable shape to receive the needle at right angles to the'bar; and in the front side of this needlebar, from the lower end upward, I cut a lonvitudinal slot or space, as indicated by dots at 7i, Fig. 2, oi' sufiicient length to receive a lever, which is .indicated by the same dots. This lever is sustained at the upper end by a jointpin, andthe lower end cxtcndsto the lower notch in the end f the needle-bar, and hold it there until it 'is released by the operation of the machine. The upper end of this needle bar Bis trml'y attached to the front end of the.

Y shaft'lby a screw, K, Figs. l, 2,'andl 3, and

the lower end receives a vihratory motion (of several. inches) parailel to thc frontend ofthe machine, as indicated bythe curved iine j, Fig. 3. This motion is producedby a crank, L, Fig. 1, on the cam-shaft m. The pin kof this cra-nk works in av siot in thelever M, Fig. l "i, (wli'ichfslot is indicated by dots at l, Fig. 3.) The upper vend .of this lever is iirinly attachedk ito the rear end of theshaft l, and its v'ibratory7 mftionl ccil'tfols the vibratory motion oi" the "needle-bar.; .--When the pin; ic acts int-he lower f portion of the slot l,jit has the greatest lever:` age andthe leveIM has the least velocity, so that rthe needle-bar will be carried inits forward* movement with grcatenforcefand less L velocitytliauwheu the crank-pin k works in.

' the upper portionoifthe s lot to bring the needlebar back for another. stitch, and while the pin' is passing-into thc curve at the lowerend the needle-bal.1` is nearly stationary, it being the time when the needle is-rc'lcased from the- .ilot-cli.) y I A .I make the thimhle-blr Hof iron or any other suitablc materialsubstantially in] the i'orinshown vin Figs. f).v and 3. v'At-'the lower end I-insert an adjusting-screw", 'with a countersink in the end to receive thef yeye of the 'f-necdle, asshown at 01, Figs. Zand 3, and alitftlc above the screw `linsertfalolzolblade, as 4 seen at o in Figs. Vhand'. 20h thefront side this bar' l have 'an inclined' plane', als indi. ,ca'ted/at o, Fig. l2f, andt'mo're fully'fshown in ."lgig; 8.` WWhen this bai: 0 passes through thc `4ihortise in tl1e-neediebar-B,\as'sllown in Fig. Ii, theinclined plane forcesbackthe notched lever and 'releasesthe needle vafter the point" llas entered the cloth."jThis thiinble-bar is\ attached` nearthe front end cfa yibrating bar, Q, above the shaft l, as shown vat N, Figs. '1,

2,' and 3. This vibrating-bar Q extends 'theY whole length (of theshaitl, andjvibrates with bearings on tnccnd of thc shaft l., as seen at 1K and O, Fig. Thisthimble-b'ar receives a vibratory inotion to force the needle-#through the cloth -and'to `release the needlefrom the needle-bar by the. operation'ot' the cani No. V3

on thev leverjP, Figs. l and 3,.x vl1ich has-its i I bearing at O, and controls.thefforward 1notion of the 'Humble-bar, andthe.,thimble-bar is thrown'back to the position shown in Fig.

2 bi me S13-Ting it 'which ,keepsthelevmr l il, v contact withtlie cam. y

To feed the 0.1013111 use aiiuted roller, @and a plain pressure-roller, i', as indicated in Figs. -i and 2, in thewellfknown wayf of feeding, m.,nsed in spinning-machinesand 'ff I workhand, s, working 'in the ratchet-wheel S, all

rolleris secured, as shown at q, Figs. i and 2,

Figsz. 1 andfl.

irulicate d' in.partitiA Figs. 1 4, ende.' These pnlleysjere revolvedfinthe `direction indicated bythe darts iuFigQby a crossband pulleys, it, areheld down by springs a', Figs. and In connection with 'these endless forced "forward across the-thread, so ets'. hto

lowerl end ofthe lever Y, Fig. .1, which is conlgear-wheelX, Figs. 1 endg.; This gear-,wheel X is revolved (in tliedirection l indicated' by thedart in Fig. @by means otfa'small wheel,

the cani-shaft mi, and' revolvcswitls therdriv-- ing-pulley V.' Illhis small wheel lmemt hal t' -wheelX makes' but one revolution while the' drivingpulley V makes two.

i; Having constructed the several into-the-cloth-holder .above the tongue b and able .size for, the thread) and secure it there, I'then, bring the needle-bar B to the. right.-k

the inclined notch of the lever.) Ywhen the mw' this ilutedjieedoller q by means the cant No. 2, acting on the lever R, with a click ,or

as shown in Fig'l.` This ratchet-wheel Sis Vfirmly secured on the rear end of the shaft T, Fig. 1, on th'elfiontend of which the :tinted and" the pressurc-rcller r yis "sustained by Aa bar, U, and the pressure given 'by'a spring, i,

This feed maybefadjustedby the screw near sto any desiredlength of stitch. I To drowthe main part of the thread thro-ugh the cloth'` and 'tocontrol the slack `thread,l use' 'four endless tapes working. on pulleys, all., as indicated ato', o, fw, andas, in'Fi'gs. 2, and* also'V .from the Adriving-pnlley V, Figrand they"v Acarryfthe eeuli'ess. tapcsjin the directionindt 'cated bythe darts in Fig. 2, and `theupper tapeslhave twohooks, y and' z, es 4shown'in Y 'Fig-.4, .their shape shown in planin Fig. 9 1

is"carried across thev t hread,`soasA to hook onto I Ait by the operation oi' thecamb', Figs. 6 and -on the lever 0",. Fi'gsQl andiil, through the inc.-A dim'nof the bent todd', as shown in Fig. l,

cud of the lever c', Fig., 1. The hook is.

hook onto. it by aspring, y,acting against 'thev nected with the rearA end ofthe 'rod Z, Figs. 1`` and 4,' and it is carried backtand held back by the operation ofthe cam A', Fig. 6, on the B', Figs. land 2, which isiirmlysecured on as many teeth-as the wbeelfX,-sothat the caniy g parts oi'tlie. f machineandarrangedgthein, Vas before-described-,1I pass-the cloth (in a suitable manner) below the jawsar a.- I passi-.he thread through the eye of v'a common 'sewing-needle'- (ofsuithandsfe o'i the cloth-holder toits full extent,` j place the eye of the' needlejiii the countersunk fend ofthe adjnstingscrew win the lowerfend ofthe thiinblbar-,xaid put the barrello .shtftA of theiieedle into the notch in the' lowe'rend'o'f the needlebar', (sof'thalt it will'be sustained by' chinenis ready forv operation, (haying thetapes,Vl 5&c., i A their places.) I the'nput-the. drivingi pulley ininction in thedirection indicated by A fthe dart, (by rnean's'fof a treadle or other vise;

when' the cani No.1, .actingl on the leverlD, will carryup'the tonguelrand-force the cloth upward between the fiaws ci a, and the crank L acting in the lower portion of the slot in the lever M j will carryfthe needle-bar forward, and the cam No. 3, acting on the lever Pwil l also carry the' thiinble-bar forward and force the oint of the needle through `the cloth,`

(while the needle is guided by the needle-ban) and while 4the 'crank L is operating in the curve of the groove rnearthe'lower end of the lever M' the thimble-bar. will advance much faster than the needle-bar and pass the bar o through the inert-iso inthe needle-bar,

Vas seenin Fig.. 3', so ,that theinclined plane at o, Figs. Zand, will force back .the notched -lever and release the 1needle from the needleliar,l whichwill then pass over :the jaws, irnlnediately afterfwhich the tongue b will be ele-Y rvated, so as to raise that portion of the needle which hasr been forced1 throu/gh vthefcloth by f the forward moveinentof the thilhblebar into the-notch in the loweren'd of the needle-bar; 'when the ca'ni'No'. 3 will release the lever P and the 'thi n1ble=bar will be thrown back 'by the springp, and theinclined ,notch in the lower end el? the lever in the needlebar will` iirmly grasp lhejneedie, and the needle-bar (in'its continued tbrward movement) will carry theneeedle with4 like thread beyond the tape-pulleys u and '/U.'

' Ent this time the projection onthc leverYwill fall into the space nearv A,`Fig. 6, on the rear. side ofthe cam-wheel X,\and the springy', Fig. 1will force the hook 2 'across and hook it onto the thread, when the cani A,`Fig.` 6,

acting-entire lever Y, Fig. 1,- will draw back` hehook z to the position shown inFig. 4, and` thus carry the Aloop of the thread to the central portion of theendless tapes, as'atl h, Figl .4,when the endless tapes will carry the threadl onward until the wholev 'is drawn through the cloth, .when the risev of thecani atG, Fig. 6,

will draw the hook` z still farther back and carry'the thread beyond the edge of the endless tapes, as shown at i', Fig. 4,' while the other side of the loop (that attaches to the needle) will be in the position shown at j', Figs.

Land 5, (anda pin-.may be used', as shown-` neanj, tokeep this portion of the loop'more certainly ont oi` the way of the needle while 'the thread is very long, but it is not very ina-y 4terial.) The needle-bar is then returned' toits first position, (the tongue'b having descended i has been drawn up to about the positionl shown at A', Fig; 4, the hook by means of the ca'InIc or the depression E) will be carried toward the needle,` so as to releasethe loop to allow it to be completelydrawnjup. Thus stitch after stitch will be taken.4

roller or otherwise) has been used for feeding for ages in -spin11ing-machines, and for feeding .cloth and various other materials; that the common sewing-needle (withj the eye Y'at one end and the point at the other) is not new,

and that earns, levers, &c., are old. Ilthere- `fore do not claim either of these as such as my invention; but r L' e What I claim as my invention, and desire'to secure by Letters;Paten-t,isf l. .The combination of the cloth-holder with the needle-bar and thimblc-bar, when' constructed and made tooperate substantially as herein described.

` 2.1m@ combinaties. @fine neediebar'and' A thimble-bar with a cominon needle, when made to operate substantially as herein described.' 3. The combination of the'feeding apparatus with the needle-bar for carrying thence die, when made te operate substantiallyfas herein described. y

.4. ,The combination of ,the needle-.bar with the .hooks and endless tape, `when arranged and Ainade to operate substantially as herein described. U. O. CROSBY. 7. Witnesses@ R. Frrzennnrn, EDWARD CRAIG.

l ain aware that a rough surface (iiu'ted 

